Error Tracking
Exceptions are grouped by what they are, not by how many times they happened. Each issue keeps its first occurrence, its latest, and the span that threw every one of them.
The surface
The list is issues, not events — each row carrying its type, the services it hits, its count over the range and when it was last seen.

What it does
One endpoint, one key. Traces, logs, metrics and sessions land on the same trace id from the first request.